#"Sodium hydroxide"#, #"sodium carbonate"#, #"sodium biphosphate"#, #"sodium fluoride"#, are all crystalline materials. And they dissolve in aqueous solutions to give quantities of #HO^(-)#. In the case of #NaOH#, the quantity is stoichiometric. Ammonia, #NH_3#, exists as a gas before dissolution in water.